CN203658249U - Optical-fiber hydrogen sensor - Google Patents
Optical-fiber hydrogen sensor Download PDFInfo
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- CN203658249U CN203658249U CN201320854260.6U CN201320854260U CN203658249U CN 203658249 U CN203658249 U CN 203658249U CN 201320854260 U CN201320854260 U CN 201320854260U CN 203658249 U CN203658249 U CN 203658249U
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Abstract
The utility model discloses an optical-fiber hydrogen sensor which is characterized by comprising an LED (Light-Emitting Diode) light source (1), a 2*1 3dB coupler (2), a WO3/Pt-plated thin film FBG (fiber bragg grating) (3), an optical spectrum analyzer (4) and a gas chamber (5); two ports on one side of the 2*1 3dB coupler (2) are respectively connected with the LED light source (1) and the optical spectrum analyzer (4), the other end of the 2*1 3dB coupler (2) is connected with the WO3/Pt-plated thin film FBG (fiber bragg grating) (3) which is arranged in the air chamber (5). The optical-fiber hydrogen sensor has high precision and repeatability, and can be used for monitoring the leakage situation of hydrogen under any concentration of hydrogen and measuring the low-concentration hydrogen in the air.
Description
Technical field
The utility model provides a kind of Optical Fider Hybrogen Sensor, belongs to technical field of optical fiber sensing.
Background technology
Hydrogen is a kind of love knot energy, be a kind of important chemical raw material, and it has been widely used in many industrial circles now.Because Optical Fider Hybrogen Sensor has some extraordinary features, such as: intrinsic security, volume is little, anti-electromagnetic interference (EMI).So it has become a Scientific Research Problem, wherein most typical is exactly FBG hydrogen gas sensor.Because its wavelength has the ability that can double, so can realize distributed measurement.Another advantage is exactly that FBG is easy to realize temperature compensation, so just can avoid light source density to change the impact bringing, thereby improves sensing accuracy.
The response time of most FBG Optical Fider Hybrogen Sensor is longer, only in the environment of low temperature and high humility, could obtain the very short response time.
Summary of the invention
The purpose of this utility model is to provide a kind of Optical Fider Hybrogen Sensor.This device can be monitored hydrogen leak under the hydrogen of any concentration, also can be for measure the hydrogen of low concentration in air.There is high precision, high repeatable.
The utility model is achieved through the following technical solutions:
The utility model provides a kind of Optical Fider Hybrogen Sensor, it is characterized in that: by LED light source (1), 2 × 1 three-dB coupler (2), be coated with WO
3/ Pt film F BG (3), spectroanalysis instrument (4) and air chamber (5) composition; 3-dB coupling mechanism (2) two ports are on one side connected with LED light source (1) and spectroanalysis instrument (4) respectively, the other end of 3-dB coupling mechanism (2) be coated with WO
3/ Pt film F BG (3) is connected, and is coated with WO
3/ Pt film F BG (3) is positioned in air chamber (5).The present invention has high precision, and repeatability can be monitored the leak case of hydrogen under the hydrogen of any concentration, also can be for measure the hydrogen of low concentration in air.Be coated with WO
3in/Pt film F BG (3), the proportion of Pt is 5%～10%.
Principle of work of the present utility model is: the central wavelength λ of FBG
bwith relation between temperature variation Δ T can be represented by following formula: Δ λ
b=(α+ξ) Δ T λ
b. wherein α represents that (for silicon, α is approximately 0.55 × 10 to expansion coefficient
-6/ DEG C), for the FBG that is 1550nm for central wavelength, at room temperature, its temperature control is approximately 14pm/ DEG C, environment temperature can change grid stroke distance (∧) by thermal diffusion (Δ ∧=α ∧ Δ T), and it equally also can change the effective refractive index n of FBG
eff.By photo-thermal effect n
eff=ξ n
effΔ T.So the change of the wavelength causing due to temperature variation is mainly owing to photo-thermal effect.
The beneficial effects of the utility model are: the WO of this sensor based on Pt
3the sensor of layer.It can, for the leak case of distributed measurement hydrogen, have the repeatability that high precision is become reconciled.
Brief description of the drawings
Fig. 1 is Optical Fider Hybrogen Sensor feature device schematic diagram of the present utility model;
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described:
Referring to accompanying drawing 1, a kind of Optical Fider Hybrogen Sensor: it is characterized in that by LED light source (1), 2 × 1 three-dB coupler (2), be coated with WO
3/ Pt film F BG (3), spectroanalysis instrument (4) and air chamber (5) composition; 3-dB coupling mechanism (2) two ports are on one side connected with LED light source (1) and spectroanalysis instrument (4) respectively, the other end of 3-dB coupling mechanism (2) be coated with WO
3/ Pt film F BG (3) is connected, and is coated with WO
3/ Pt film F BG (3) is positioned in air chamber (5).Be coated with WO
3in/Pt film F BG (3), the proportion of Pt is 6.5%.
In the time that the concentration of hydrogen in unit volume is 1%, the wavelength of FBG1, FBG2, FBG3 moves and is respectively 15nm, 22nm, and 18nm. is in the time that the concentration of hydrogen in unit volume is 4%, corresponding wavelength moves and is respectively 88pm, 140pm, 115pm.
Claims (2)
1. an Optical Fider Hybrogen Sensor: it is characterized in that by LED light source (1), 2 × 1 three-dB coupler (2), be coated with WO
3/ Pt film F BG (3), spectroanalysis instrument (4) and air chamber (5) composition; 3-dB coupling mechanism (2) two ports are on one side connected with LED light source (1) and spectroanalysis instrument (4) respectively, the other end of 3-dB coupling mechanism (2) be coated with WO
3/ Pt film F BG (3) is connected, and is coated with WO
3/ Pt film F BG (3) is positioned in air chamber (5).
2. a kind of Optical Fider Hybrogen Sensor according to claim 1, is characterized in that: be coated with WO
3in/Pt film F BG (3), the proportion of Pt is 5%～10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320854260.6U CN203658249U (en) | 2013-12-17 | 2013-12-17 | Optical-fiber hydrogen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320854260.6U CN203658249U (en) | 2013-12-17 | 2013-12-17 | Optical-fiber hydrogen sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203658249U true CN203658249U (en) | 2014-06-18 |
Family
ID=50924626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320854260.6U Expired - Fee Related CN203658249U (en) | 2013-12-17 | 2013-12-17 | Optical-fiber hydrogen sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203658249U (en) |
-
2013
- 2013-12-17 CN CN201320854260.6U patent/CN203658249U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140618 Termination date: 20191217 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |